Quote:
Originally Posted by jwetering
The big non-replaceable IMS bearing came along in 2005. In fact the early 997 cars (2005) still shipped with the small bearing. It wasn't until 2006 that they switched over.
It was different for the replacement engines though. My 2002 car had a new engine installed in 2005 and it's a big bearing motor.
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Not entirely correct; the oversized IMS started appearing in a fair number of the factory engines of the 2005 model year cars, which has and continues to be a major headache for the shops. There is literally no way to know which style bearing is in a 2005 car without taking it apart; manufacturing dates and VIN numbers have proven useless, so we consider all 2005 cars suspect until we get a look at the IMS center bolt.
At one time, I thought the total number of these cars was only a small percentage of the year's output, but time appears to have put that theory to waste. And any replacement engine coming out of Porsche after mid to late 2005 will carry the large IMS.